SU781902A1 - Device for reproducing phase-modulated signals - Google Patents

Description

The invention relates to techniques for processing information and is intended for use in the storage devices of computers on magnetic media.

A device for reproducing ⁵ phase-modulated signals is known, in which information and clock pulses are extracted when the multivibrators 14

However, it does not provide proper operation at considerable fluctuations pe- ⁰ IRS reproduced signal.

The closest in technical essence to the proposed one is a device containing output buses of information signals and clock pulses, as well as an NAND element and an input bus of information signals connected via a threshold device and an And element connected to a trigger, the second input of which is connected to a reset bus , three triggers, four AND elements, delay lines, multivibrators and a differentiating chain (2].

A disadvantage of the known device is its circuit complexity and insufficiently high noise immunity, since the correct operation of the device is not ensured with significant fluctuations in the period of reproducible signals.

The chain of the invention is to simplify the device and increase its noise immunity.

This goal is achieved by the fact that in a known device containing output buses of information signals and clock pulses, as well as an NAND element and an input bus of information signals connected through a series-connected threshold device and an And element to a trigger, the second input of which is connected to a reset bus, the integrator and the rectifier unit are connected in series, while the integrator input is connected to the input bus of information signals, the output of the rectifier unit is connected to the second input of the element And, and the element AND-NOT connected between.

the output of the threshold device, the output of the And element connected to the clock bus, and the third trigger input, the output of which is connected to the output bus of information signals.

In FIG. 1 shows a structural block diagram of a device; in FIG. 2 - time diagrams of the operation of the device.

The device consists of a threshold device 1, an input connected to the input bus ₁₀ hydrochloric device 2, and the output connected to one input of AND gate 3 itself, and with a single trigger input 4 - via NAND 5.Vhodnaya bus 2 connected to the other device the input of the And 3 element through the integrator 6 and the rectifier block 7. The output of the And 3 element is connected to the output bus 8 of the clock pulses, to the other input of the AND-NOT 5 element and to the zero input of the trigger-20 ra 4, the single output of which is connected to the output bus 9 of the code device pulses through former 10 pulses. The device reset bus 11 is connected to the trigger zero input of trigger 4.

The device operates as follows.

If a magnetic medium written phase-shift keyed signal (diagram 1, Fig. 2), the reproduced signal from the magnetic carrier as a result of instability of the magnetic carrier velocity and other distorting factors is a signal with large fluctuation ₃₅ tuatsiyami nominal period (curve 2, Fig. 2 ) The reproduced signal is input to an integrator 6 that integrates the reproduced signal ^(h ra epyu 3, FIG. 2). The integrated signal is fed to the input of the rectifier unit 7, which generates the absolute value of the integrated signal (plot 4, Fig. 2). The absolute value of the integrated signal is supplied to the control input '45 of the And 3 element. When triggered from the zero level of the reproduced signal, the zero-organ 1 generates pulses (plot 5, Fig. 2), which are fed to the first input of the AND-NOT element 5. Edement And 3 _5Q generates synchronizing pulses (plot 6, Fig. 2), which are fed to the output bus 8 of the synchronizing pulses, to the zero input of trigger 4 and to the other input of the AND – NOT 5 element, which generates pulses to the output in the periods in which it is recorded code of units (diagram 7, Fig. 2). These pulses put trigger 4 in a single state. Trigger 4 is set to the zero state by a synchronizing pulse. The signals from the single output of trigger 4 (diagram 8, Fig. 2) are supplied to a pulse shaper 10 which generates code pulses (diagram 9, Fig. 2) from the trailing edge of the signal during the trigger, time-aligned synchronizing pulses. The code pulses from the output of the shaper 10 ι enter the output bus of the code pulses of the device 9. The device is reset to the initial state by a pulse coming through the reset bus 11 of the device.

The proposed device allows you to highlight the code and synchronizing pulses even when spurious fluctuations of the period exceed 1/4 of the nominal period, and the known device in such cases functions erroneously. In addition, the device is much simpler in circuit terms.

Claims (2)

(54) DEVICE FOR REPRODUCING PHASE MODULATED SIGNALS The invention relates to an information processing technique and is intended for use in memory devices of computers on magnetic media. A device for reproducing phase-modulated signals is known, in which information and sync pulses are extracted with the roma of the multivibrators ij. However, it does not ensure proper operation with significant fluctuations in the period of the reproduced signal. The closest in technical essence to the present invention is a device that contains output slots of informative signals and sync pulses, and also an NAND element and an input information signal connected through a series-connected threshold device and an element And a trigger whose second input is connected to a reset bus, three trigger, four AND elements, delay lines, multivibrators and a 12 J differentiating chain. A disadvantage of the known device is its circuit complexity and insufficiently high interference Resistant, since no correct operation of the device is provided with significant fluktatsi x period. reproduced signals. The circuit of the invention is the oppression of the device and the enhancement of its stability. This goal is achieved by the fact that in a known device containing output buses information signals and snho-. pulses, as well as the H-flE element and the input bus of information-signaling signals, connected via a serially connected threshold device, to the trigger element, the second input of which is connected to the reset bus, are subsequently connected to the integrator and the straightening unit, the STOM input of the integrator is connected the input bus of information signals, the output of a wireless unit is connected to the second input of the AND element, and the AND-NOT element is connected between. The output of the threshold device, the output element And connected to the bus clock pulses, and the third trigger input, the output of which with the output bus information signals. FIG. Figure 1 shows the structural block diagram of a device; in fig. 2 - timing charts of the device. The device consists of a threshold device 1, an input connected to the input bus 2 of the device, and an output connected to one input of the element I 3 directly, and to a single input of the trigger 4 through an element NOT B. The input to the bus 2 of the device is connected to another input of the element And 3 through the integrator 6 and the rectifying unit 7. The output of the element AND 3 is connected to the output bus 8 clock pulses, to another input of the element AND-NE 5 and to the zero input of trigger 4, the unit output of which is connected to the output bus 9 code pulses of the device through form ovatel 10 pulses. Bus 11 reset device is connected to the input of the installation of the zero trigger 4.. The device works as follows. If a phase-manipulated signal is recorded on magnetic media (plot 1, Fig. 2), the signal reproduced from the magnetic carrier as a result of instability of the speed of movement of the magnetic carrier and other distorting factors is a signal with large fluctuations of the nominal period (plot 2, Fig. 2 ). The reproduced signal is fed to the input of the integrator 6, which integrates the reproduced signal (3, Fig. 2). The integrated signal is fed to the input of the rectifier unit 7, which produces the absolute value of the integrated signal (plot 4 of Fig. 2). The absolute value of the integrated signal is fed to the control input of the element 3. A response from the zero level of the reproduced signal, the null organ 1 produces pulses (plot 5, fig. 2), which are fed to the first input of the AND-NOT element 5. Element AND 3 generates synchronizing pulses (plot 6, fig. 2), which arrive at the output bus 8 of synchronizing pulses, to the zero input of the trigger 4 and to the other input of the element AND-NOT 5, the output signals the output pulses in those periods In which the code of the units is written (plot 7, fig. 2). These pulses set trigger 4 to one. The trigger 4 to the zero state is set by a synchronizing pulse. The signals from the unit output of the trigger 4 (plot 8, fig. 2) are sent to the shaper lO pulses which generates code pulses (plot 9, fig. 2) from the trailing edge of the signal at the trigger output, tied in time to the clock pulses. The code pulses from the output of the imaging unit 10 are fed to the output bus of the code pulses of the device 9. The device is reset to its initial state by a pulse coming through the device reset bus 11. The proposed device allows to extract code and synchronizing pulses even when parasitic period fluctuations exceed 1/4 of the nominal period, and the known device in such cases functions erroneously. Moreover, the device is much simpler in terms of circuitry. Apparatus of the Invention A device for reproducing phase-modulated signals comprising output buses of information signals and sync pulses, as well as an NAND element and an input bus of information signals connected via a serially connected threshold device AND to the trigger, the second input of which is connected to the reset bus, different By the fact that, in order to increase the noise immunity and simplify the device, a sequentially connected integrator and a rectifier unit are inserted into it, and the integrator input is connected to the input bus of information signals, the output of the rectifier unit is connected to the second input of the element AND, and the element AND is NOT connected between the output of the threshold device, the output of the element And connected to the clock bus, and the third input of the trigger, the output of which is connected to the output bus information signals. Sources of information taken into account during the examination 1. USSR author's certificate NO 330486, cl. Q 11 B 5 / 00.03.04.69. 2. Authors certificate of the USSR Co 349017, cl. S 11 V 15/00, 13.10.70 (prototype). v: / four / X X7 Xy I I I I III I I rn / e.